Naha Airport is the primary airport serving the entire island of Okinawa. It’s also a pretty good distance from “mainland” Japan—about a two and a half hour flight from Tokyo.
My trip to Okinawa took me through Dallas/Fort Worth (DFW) and Tokyo Haneda (HND), with long layovers at both. By the time I finally landed at OKA, it was already 22:30 local and I’d been traveling for 30 hours, so I didn’t have much opportunity or energy to look around. My return departure from OKA wasn’t until 13:55 local, though, so I got to the airport a few hours early to explore.